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Noisy speakers may not scare away crows during winter

By Isabella Vesperini

Posted February 8, 2024

Crows tend to spend time during the day on the outskirts of town and come back to campus at night to roost. (Sardaka/Wikimedia Commons)

Speakers that emit predator calls to scare away crows have been used on IU’s campus for years. The Global and International Studies Building has some on its roof. They are also by Swain West behind Dunn Woods to address the large number of crows that gather there. However, speakers alone may not be enough.

Alex Jahn, research scientist in the IU biology department, said speakers along with plastic models of predators, such as Cooper hawks, may be more effective.

Bird decoy with bird call speaker (Forest and Kim Starr / Wikimedia Commons)

“Speakers are probably useful in combination with other methods,” Jahn said. “Birds and animals in general will get used to a stimulus and become tolerant of it, so they won't respond to it over time.”

Jahn said crows tend to gather in Dunn Woods because the tall trees offer warmth and protection from ground predators, such as cats. Crows also seek protection from Cooper hawks, their primary predator.

“The habitat they're [crows] searching for probably when they go to roost at night is a type of cover that would protect them from a flying predator that could attack them directly,” Jahn said. “It would be more difficult for a hawk to maneuver through all the vegetation to get to the crow's roosting site.”

While crows are in Bloomington year-round, Jahn said more come during the winter in search of more food and warmth. Many come from the colder areas of Canada and Minnesota. Crows tend to spend time during the day on the outskirts of town and come back to campus at night to roost.

“If we as humans are creating spaces for them where they feel safe, these urban areas where they are getting more protection from predators at night or they feel like they can find more food and warmth, especially in the winter, then these animals, crows and other birds, are going to respond to that,” Jahn said.

While the area surrounding Dunn Woods is dirty with crow droppings and is loud, Jahn said the City should find a balance between imposing on nature and keeping people safe.

“City managers [will have] to understand how to manage the welfare of people with wildlife occupying Bloomington without going overboard in terms of trying to make the city so safe that we get rid of all the wildlife,” Jahn said. “We want wildlife also in our lives.”